package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.apache.commons.io.output.FileWriterWithEncoding;
import org.bouncycastle.x509.X509StreamParser;

import com.thoughtworks.xstream.XStream;

public class GroupDataGenerator {


	public static void main(String[] args) throws IOException {
	  if (args.length < 3) {
		  System.out.println("please specify parametrs: <amount of test data> <file> <format>");
		  return;
	  }
	  
	  int amount = Integer.parseInt(args[0]);
	  File file = new File(args[1]);
	  String format = args[2];
	  
	  
	  if(file.exists()) {
		  System.out.println("File exists, please remote it manually: " + file);
		  return;
	  }
	  
	  List<GroupData> groups = generateRandomGroups(amount);
	  if ("csv".equals(format)) {
		  saveGroupsToCsvFile(groups, file);
	  } else if ("xml".equals(format)) {
		  saveGroupsToXmlFile(groups, file);
	  }	  else { System.out.println("Unknown format " + format);
	  return;
		  }
	  }

	private static void saveGroupsToXmlFile(List<GroupData> groups, File file) throws IOException {
	  XStream xstream = new XStream();
	  xstream.alias("group", GroupData.class);
	  String xml = xstream.toXML(groups);
	  FileWriter writer = new FileWriter(file);
	  writer.write(xml);
	  writer.close();
	}
	
	public static List<GroupData> loadGroupsFromXmlFile(File file) {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		return (List<GroupData>)xstream.fromXML(file);
		
	}
	private static void saveGroupsToCsvFile(List<GroupData> groups, File file) throws IOException {
	   	FileWriter writer = new FileWriter(file);
	   	for (GroupData group : groups) {
	   	    writer.write(group.getName() + "," + group.getHeader() + "," + group.getFooter() + ",!" + "\n"); 	
		}
	   	writer.close();
	}
	
	public static List<GroupData> LoadGroupsFromCsvFile(File file) throws IOException{
		List<GroupData> list = new ArrayList<GroupData>();
	    FileReader reader = new FileReader(file);
	    BufferedReader bufferedReader = new BufferedReader(reader);
	    String line = bufferedReader.readLine();
	    while (line != null) {
	      String[] part = line.split(",");
	      GroupData group = new GroupData()
	      .withName(part[0])
	      .withHeader(part[1])
	      .whithFooter(part[2]);
	      list.add(group);
	      line = bufferedReader.readLine();
		}
	    bufferedReader.close();
		return list;
	}
	public static List<GroupData> generateRandomGroups(int amount) {
		List<GroupData> list = new ArrayList<GroupData>();
	      for (int i = 0; i < amount; i++) {
	    	GroupData group	= new GroupData()
	    	.withName(generateRandomString())
	    	.withHeader(generateRandomString())
	    	.whithFooter(generateRandomString());
	    	list.add(group);
	      }
	      return list;
	} 
	 
	public static String generateRandomString() {
    	Random rnd = new Random();
    	if (rnd.nextInt(3) == 0) {
	    	return "";	
	    	} else {
	    	return "test" + rnd.nextInt(); 	
	    	}
          }
	  
	}


